JP6358101B2 - Abnormality diagnosis device - Google Patents

Abnormality diagnosis device Download PDF

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JP6358101B2
JP6358101B2 JP2015004189A JP2015004189A JP6358101B2 JP 6358101 B2 JP6358101 B2 JP 6358101B2 JP 2015004189 A JP2015004189 A JP 2015004189A JP 2015004189 A JP2015004189 A JP 2015004189A JP 6358101 B2 JP6358101 B2 JP 6358101B2
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sensor
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abnormality
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JP2016130457A (en
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藤井　宏明
宏明 藤井
真吾 中田
真吾 中田
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Denso Corp
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Denso Corp
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Priority to US15/519,943 priority patent/US10072542B2/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/022—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters characterised by specially adapted filtering structure, e.g. honeycomb, mesh or fibrous
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1466—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being a soot concentration or content
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
    • F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
    • F01N3/033—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices
    • F01N3/035—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters in combination with other devices with catalytic reactors, e.g. catalysed diesel particulate filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/204—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using an exhaust gas igniter, e.g. a spark or glow plug, without introducing fuel into exhaust duct
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2200/00—Input parameters for engine control
    • F02D2200/02—Input parameters for engine control the parameters being related to the engine
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0812—Particle filter loading
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/02—Air cleaners
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

Description

本発明は、内燃機関の排出ガス中の粒子状物質を捕集するフィルタを備えたシステムの異常診断装置に関する発明である。   The present invention relates to an abnormality diagnosis apparatus for a system including a filter that collects particulate matter in exhaust gas from an internal combustion engine.

車両に搭載される内燃機関においては、燃費規制の強化に伴って、筒内噴射式のガソリンエンジンの需要増加が予想されている。しかし、筒内噴射式のガソリンエンジンは、吸気ポート噴射式のガソリンエンジンに比べて、ＰＭ（Particulate Matter：粒子状物質）の排出量が多くなるという問題がある。この対策として、エンジンの排気通路にエンジンから排出されるＰＭを捕集するフィルタを配置するようにしたものがある。   In internal combustion engines mounted on vehicles, demand for in-cylinder gasoline engines is expected to increase as fuel efficiency regulations are tightened. However, the in-cylinder injection type gasoline engine has a problem that the amount of PM (Particulate Matter) emission increases as compared with the intake port injection type gasoline engine. As a countermeasure, there is one in which a filter for collecting PM discharged from the engine is disposed in the exhaust passage of the engine.

このようなＰＭ捕集用のフィルタの異常診断技術として、例えば、特許文献１（特開２００７−３１５２７５号公報）に記載されたものがある。このものは、ＰＭ捕集用のフィルタの下流側に排出ガス中のＰＭ量を検出するＰＭセンサを設け、フィルタの捕集効率が所定値以上となる条件下において、ＰＭセンサで検出したＰＭ量が判定値を越えたか否かによってフィルタの故障の有無を判定するようにしている。   As an abnormality diagnosis technique of such a filter for collecting PM, for example, there is one described in Patent Document 1 (Japanese Patent Laid-Open No. 2007-315275). This is provided with a PM sensor that detects the amount of PM in the exhaust gas downstream of the filter for collecting PM, and the amount of PM detected by the PM sensor under the condition that the collection efficiency of the filter exceeds a predetermined value. Whether or not there is a filter failure is determined based on whether or not the value exceeds the determination value.

また、従来、ＰＭ捕集用のフィルタにおいては、フィルタに設けられた複数のセルのうちの一部のセルの入口側が閉鎖されて残りのセル（つまり入口側が開放されたセル）の出口側が閉鎖された構造としたものがある。   Conventionally, in a filter for collecting PM, the inlet side of some of the plurality of cells provided in the filter is closed and the outlet side of the remaining cells (that is, cells whose inlet side is opened) is closed. There is what was made the structure.

特開２００７−３１５２７５号公報JP 2007-315275 A

上記従来のフィルタは、入口側が開放されたセルに流入した排出ガスのほぼ全てが、セルを区画する多孔質の隔壁（仕切壁）を通過して、出口側が開放されたセルから流出し、排出ガスが隔壁を通過する際に排出ガス中のＰＭを捕集するようにしたものであるが、排気の圧力損失が増大するという欠点がある。   In the above conventional filter, almost all of the exhaust gas flowing into the cell with the inlet side opened passes through the porous partition wall (partition wall) that partitions the cell, flows out of the cell with the outlet side opened, and is discharged. Although the PM in the exhaust gas is collected when the gas passes through the partition wall, there is a drawback that the pressure loss of the exhaust gas increases.

そこで、本出願人は、フィルタによる排気の圧力損失を低減するために、複数のセルのうちの一部のセルの入口側が閉鎖されて残りのセルのうち出口側が開放されたセルを少なくとも一つ以上有する構造（又は一部のセルの出口側が閉鎖されて残りのセルのうち入口側が開放されたセルを少なくとも一つ以上有する構造）の片栓フィルタを備えたシステムを研究しているが、その研究過程で次のような新たな課題が判明した。   In order to reduce the pressure loss of the exhaust gas by the filter, the applicant of the present invention has at least one cell in which the inlet side of some of the plurality of cells is closed and the outlet side of the remaining cells is opened. We are studying a system with a single plug filter having the above structure (or a structure having at least one cell in which the outlet side of some cells is closed and the inlet side among the remaining cells is opened). The following new issues were found during the research process.

図８に示すように、従来のフィルタは、ＰＭ堆積量が増加した後はＰＭ捕集率がほぼ１００％に維持されるが、片栓フィルタは、ＰＭ堆積量が増加した後もＰＭ捕集率が従来のフィルタよりも低い捕集率（１００％よりも低い捕集率）に維持される。   As shown in FIG. 8, in the conventional filter, the PM collection rate is maintained at almost 100% after the PM accumulation amount is increased. However, in the single plug filter, the PM collection amount is increased even after the PM accumulation amount is increased. The rate is maintained at a lower collection rate than the conventional filter (collection rate lower than 100%).

このため、片栓フィルタを備えたシステムでは、図９に示すように、片栓フィルタの異常によりＰＭ捕集率が低下した場合に、センサ検出ＰＭ量（ＰＭセンサで検出したＰＭ量）が増加するだけでなく、図１０に示すように、エンジンの異常によりエンジンから排出されるＰＭ量が増加した場合にも、センサ検出ＰＭ量が増加する。また、ＰＭセンサ自体の異常によりセンサ検出ＰＭ量が増加する可能性もある。従って、上記特許文献１の技術のように、ＰＭセンサで検出したＰＭ量を判定値と比較するだけでは、エンジンの異常と片栓フィルタの異常とＰＭセンサの異常とを区別して判定することができず、エンジンと片栓フィルタとＰＭセンサのいずれかに異常が発生した場合に、その異常箇所を特定することができない。   For this reason, in a system equipped with a single plug filter, as shown in FIG. 9, when the PM collection rate decreases due to an abnormality of the single plug filter, the sensor detected PM amount (the PM amount detected by the PM sensor) increases. In addition, as shown in FIG. 10, when the amount of PM discharged from the engine increases due to engine abnormality, the sensor detected PM amount increases. In addition, the PM amount detected by the sensor may increase due to abnormality of the PM sensor itself. Therefore, as in the technique of the above-mentioned Patent Document 1, only by comparing the PM amount detected by the PM sensor with the determination value, it is possible to distinguish between the engine abnormality, the one-piece filter abnormality, and the PM sensor abnormality. When an abnormality occurs in any one of the engine, the single-ended filter, and the PM sensor, the abnormality location cannot be specified.

そこで、本発明が解決しようとする課題は、内燃機関と片栓フィルタとＰＭセンサのいずれかに異常が発生した場合に、その異常箇所を特定することができる異常診断装置を提供することにある。   Therefore, the problem to be solved by the present invention is to provide an abnormality diagnosis device capable of specifying an abnormality location when an abnormality occurs in any of the internal combustion engine, the single plug filter, and the PM sensor. .

上記課題を解決するために、本発明は、内燃機関（１１）の排出ガス中の粒子状物質（以下「ＰＭ」と表記する）を捕集するフィルタであって該フィルタに設けられた複数のセル（３３）のうちの一部のセルの入口側が閉鎖されて残りのセルのうち出口側が開放されたセルを少なくとも一つ以上有する構造又は一部のセルの出口側が閉鎖されて残りのセルのうち入口側が開放されたセルを少なくとも一つ以上有する構造の片栓フィルタ（３１）と、この片栓フィルタ（３１）の上流側排気圧と下流側排気圧との差を検出する差圧センサ（３６）と、片栓フィルタ（３１）を通過した排出ガス中のＰＭ量を検出するＰＭセンサ（３２）と、片栓フィルタ（３１）に流入するＰＭ量と片栓フィルタ（３１）に捕集されるＰＭ量と片栓フィルタ（３１）から流出するＰＭ量のうちのいずれか一つのＰＭ量である診断用ＰＭ量を内燃機関（１１）の運転条件に基づいて推定する第１の推定手段（３０）と、診断用ＰＭ量を差圧センサ（３６）の出力に基づいて推定する第２の推定手段（３０）と、診断用ＰＭ量をＰＭセンサ（３２）の出力に基づいて推定する第３の推定手段（３０）と、第１の推定手段（３０）で推定した診断用ＰＭ量（以下「内燃機関（１１）の運転条件に基づいた推定ＰＭ量」という）と、第２の推定手段（３０）で推定した診断用ＰＭ量（以下「差圧センサ（３６）の出力に基づいた推定ＰＭ量」という）と、第３の推定手段（３０）で推定した診断用ＰＭ量（以下「ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量」という）とを比較して、内燃機関（１１）の異常と片栓フィルタ（３１）の異常とＰＭセンサ（３２）の異常とを区別して判定する異常診断手段（３０）とを備えた構成としたものである。   In order to solve the above problems, the present invention is a filter for collecting particulate matter (hereinafter referred to as “PM”) in exhaust gas of an internal combustion engine (11), and a plurality of filters provided on the filter. A structure having at least one cell in which the inlet side of some of the cells (33) is closed and the outlet side of the remaining cells is open or the outlet side of some of the cells is closed and Of these, a single plug filter (31) having a structure having at least one cell whose inlet side is opened, and a differential pressure sensor (for detecting a difference between the upstream exhaust pressure and the downstream exhaust pressure of the single plug filter (31)) 36), a PM sensor (32) for detecting the amount of PM in the exhaust gas that has passed through the single plug filter (31), and the amount of PM flowing into the single plug filter (31) and the single plug filter (31). PM amount and single plug filter (3 ) First estimating means (30) for estimating a diagnostic PM amount that is any one of the PM amounts outflowing from the internal combustion engine (11), and the diagnostic PM amount Second estimation means (30) for estimating based on the output of the differential pressure sensor (36), third estimation means (30) for estimating the diagnostic PM amount based on the output of the PM sensor (32), The diagnostic PM amount estimated by the first estimating means (30) (hereinafter referred to as "estimated PM amount based on the operating condition of the internal combustion engine (11)") and the diagnostic PM amount estimated by the second estimating means (30) The PM amount (hereinafter referred to as “estimated PM amount based on the output of the differential pressure sensor (36)”) and the diagnostic PM amount estimated by the third estimating means (30) (hereinafter referred to as “output of the PM sensor (32)”) The estimated PM amount based on the difference between the internal combustion engine (11) It is obtained by a structure having a with Katasen filter (31) of the abnormality and PM sensor (32) of the abnormality and the abnormality diagnosing means for determining to distinguish (30) and.

内燃機関と片栓フィルタとＰＭセンサが全て正常であれば、内燃機関の運転条件に基づいた推定ＰＭ量と、差圧センサの出力に基づいた推定ＰＭ量と、ＰＭセンサの出力に基づいた推定ＰＭ量とがほぼ一致するはずである。しかし、内燃機関と片栓フィルタとＰＭセンサのいずれかに異常が発生すると、その異常箇所に対応した推定ＰＭ量が他の推定ＰＭ量と異なってくる。従って、内燃機関の運転条件に基づいた推定ＰＭ量と、差圧センサの出力に基づいた推定ＰＭ量と、ＰＭセンサの出力に基づいた推定ＰＭ量とを比較すれば、内燃機関の異常と片栓フィルタの異常とＰＭセンサの異常とを区別して判定することができる。これにより、内燃機関と片栓フィルタとＰＭセンサのいずれかに異常が発生した場合に、その異常箇所を特定することができる。   If the internal combustion engine, the single-ended filter, and the PM sensor are all normal, the estimated PM amount based on the operating condition of the internal combustion engine, the estimated PM amount based on the output of the differential pressure sensor, and the estimation based on the output of the PM sensor The PM amount should almost match. However, when an abnormality occurs in any one of the internal combustion engine, the single-ended filter, and the PM sensor, the estimated PM amount corresponding to the abnormal portion is different from other estimated PM amounts. Therefore, if the estimated PM amount based on the operating condition of the internal combustion engine, the estimated PM amount based on the output of the differential pressure sensor, and the estimated PM amount based on the output of the PM sensor are compared, abnormalities in the internal combustion engine and It is possible to distinguish between the abnormality of the plug filter and the abnormality of the PM sensor. Thereby, when an abnormality occurs in any of the internal combustion engine, the single plug filter, and the PM sensor, the abnormal part can be identified.

図１は本発明の一実施例におけるエンジン制御システムの概略構成を示す図である。FIG. 1 is a diagram showing a schematic configuration of an engine control system in one embodiment of the present invention. 図２は片栓フィルタの排出ガス流れ方向に沿った断面図である。FIG. 2 is a cross-sectional view of the single-ended filter along the exhaust gas flow direction. 図３は片栓フィルタの入口側の排出ガス流れ方向に対して直角方向に沿った断面図である。FIG. 3 is a cross-sectional view taken along the direction perpendicular to the direction of exhaust gas flow on the inlet side of the single-ended filter. 図４は片栓フィルタの出口側の排出ガス流れ方向に対して直角方向に沿った断面図である。FIG. 4 is a cross-sectional view taken along a direction perpendicular to the exhaust gas flow direction on the outlet side of the single plug filter. 図５はリニアタイプのＰＭセンサの出力特性図である。FIG. 5 is an output characteristic diagram of a linear type PM sensor. 図６は積算タイプのＰＭセンサの出力特性図である。FIG. 6 is an output characteristic diagram of the integration type PM sensor. 図７は差圧センサ出力とＰＭ堆積量との関係を示す図である。FIG. 7 is a diagram showing the relationship between the differential pressure sensor output and the PM accumulation amount. 図８はＰＭ堆積量とＰＭ捕集率との関係を示す図である。FIG. 8 is a diagram showing the relationship between the PM deposition amount and the PM collection rate. 図９はフィルタ異常によりＰＭ捕集率が低下した場合のセンサ検出ＰＭ量の挙動を示すタイムチャートである。FIG. 9 is a time chart showing the behavior of the sensor detected PM amount when the PM collection rate decreases due to filter abnormality. 図１０はエンジン異常によりエンジン排出ＰＭ量が増加した場合のセンサ検出ＰＭ量の挙動を示すタイムチャートである。FIG. 10 is a time chart showing the behavior of the sensor detected PM amount when the engine exhaust PM amount increases due to engine abnormality. 図１１はエンジン運転条件に基づいた推定ＰＭ量の推定方法を説明する図である。FIG. 11 is a diagram for explaining an estimation method of the estimated PM amount based on the engine operating conditions. 図１２はエンジン異常の場合の各推定ＰＭ量の関係を示す図である。FIG. 12 is a diagram showing the relationship between the estimated PM amounts when the engine is abnormal. 図１３はフィルタ異常の場合の各推定ＰＭ量の関係を示す図である。FIG. 13 is a diagram showing the relationship between the estimated PM amounts in the case of a filter abnormality. 図１４はフィルタ再生異常の場合の各推定ＰＭ量の関係を示す図である。FIG. 14 is a diagram showing the relationship between estimated PM amounts in the case of filter regeneration abnormality. 図１５はＰＭセンサ異常の場合の各推定ＰＭ量の関係を示す図である。FIG. 15 is a diagram showing the relationship between the estimated PM amounts in the case of PM sensor abnormality. 図１６は異常診断ルーチンの処理の流れを示すフローチャート（その１）である。FIG. 16 is a flowchart (No. 1) showing the flow of processing of the abnormality diagnosis routine. 図１７は異常診断ルーチンの処理の流れを示すフローチャート（その２）である。FIG. 17 is a flowchart (No. 2) showing the flow of processing of the abnormality diagnosis routine.

以下、本発明を実施するための形態を具体化した一実施例を説明する。
まず、図１に基づいてエンジン制御システムの概略構成を説明する。 Hereinafter, an embodiment embodying a mode for carrying out the present invention will be described.
First, a schematic configuration of the engine control system will be described with reference to FIG.

筒内噴射式の内燃機関であるエンジン１１は、燃料としてガソリンを筒内に直接噴射する筒内噴射式のガソリンエンジンである。このエンジン１１の吸気管１２の最上流部には、エアクリーナ１３が設けられ、このエアクリーナ１３の下流側に、吸入空気量を検出するエアフローメータ１４が設けられている。このエアフローメータ１４の下流側には、モータ１５によって開度調節されるスロットルバルブ１６と、このスロットルバルブ１６の開度（スロットル開度）を検出するスロットル開度センサ１７とが設けられている。   An engine 11 that is an in-cylinder internal combustion engine is an in-cylinder injection gasoline engine that directly injects gasoline as fuel into a cylinder. An air cleaner 13 is provided at the most upstream portion of the intake pipe 12 of the engine 11, and an air flow meter 14 for detecting the intake air amount is provided downstream of the air cleaner 13. A throttle valve 16 whose opening is adjusted by a motor 15 and a throttle opening sensor 17 for detecting the opening (throttle opening) of the throttle valve 16 are provided on the downstream side of the air flow meter 14.

更に、スロットルバルブ１６の下流側には、サージタンク１８が設けられ、このサージタンク１８に、吸気管圧力を検出する吸気管圧力センサ１９が設けられている。また、サージタンク１８には、エンジン１１の各気筒に空気を導入する吸気マニホールド２０が設けられ、エンジン１１の各気筒には、それぞれ筒内に燃料（ガソリン）を直接噴射する燃料噴射弁２１が取り付けられている。また、エンジン１１のシリンダヘッドには、各気筒毎に点火プラグ２２が取り付けられ、各気筒の点火プラグ２２の火花放電によって各気筒内の混合気に着火される。   Further, a surge tank 18 is provided on the downstream side of the throttle valve 16, and an intake pipe pressure sensor 19 for detecting the intake pipe pressure is provided in the surge tank 18. The surge tank 18 is provided with an intake manifold 20 that introduces air into each cylinder of the engine 11. Each cylinder of the engine 11 has a fuel injection valve 21 that directly injects fuel (gasoline) into the cylinder. It is attached. An ignition plug 22 is attached to the cylinder head of the engine 11 for each cylinder, and the air-fuel mixture in each cylinder is ignited by spark discharge of the ignition plug 22 of each cylinder.

一方、エンジン１１の排気管２３には、排出ガスの空燃比又はリッチ／リーン等を検出する排出ガスセンサ２４（空燃比センサ又は酸素センサ等）が設けられ、この排出ガスセンサ２４の下流側に、排出ガス中のＣＯ，ＨＣ，ＮＯX 等を浄化する三元触媒等の触媒２５が設けられている。 On the other hand, the exhaust pipe 23 of the engine 11 is provided with an exhaust gas sensor 24 (such as an air-fuel ratio sensor or an oxygen sensor) that detects the air-fuel ratio or rich / lean of the exhaust gas. A catalyst 25 such as a three-way catalyst for purifying CO, HC, NO x and the like in the gas is provided.

また、エンジン１１の排気管２３のうちの触媒２５の下流側には、エンジン１１の排出ガス中のＰＭ（Particulate Matter：粒子状物質）を捕集する片栓フィルタ３１が設けられている。触媒２５と片栓フィルタ３１は、一つのケース内に収容するようにしても良いし、別々のケース内に収容するようにしても良い。更に、片栓フィルタ３１の下流側には、片栓フィルタ３１を通過した排出ガス中のＰＭ量を検出するＰＭセンサ３２が設けられている。   A single plug filter 31 that collects PM (Particulate Matter) in the exhaust gas of the engine 11 is provided on the downstream side of the catalyst 25 in the exhaust pipe 23 of the engine 11. The catalyst 25 and the single plug filter 31 may be accommodated in one case or in separate cases. Furthermore, a PM sensor 32 that detects the amount of PM in the exhaust gas that has passed through the single plug filter 31 is provided on the downstream side of the single plug filter 31.

また、片栓フィルタ３１の上流側排気圧と下流側排気圧との差（前後差圧）を検出する差圧センサ３６が設けられている。尚、片栓フィルタ３１の上流側と下流側に、それぞれ排気圧を検出する圧力センサを設け、上流側の圧力センサで検出した上流側排気圧と下流側の圧力センサで検出した下流側排気圧との差（前後差圧）を算出するようにしても良い。この場合、上流側及び下流側の圧力センサが差圧センサとしての役割を果たす。   In addition, a differential pressure sensor 36 is provided for detecting a difference (front-rear differential pressure) between the upstream exhaust pressure and the downstream exhaust pressure of the single plug filter 31. Pressure sensors that detect the exhaust pressure are provided on the upstream side and the downstream side of the single plug filter 31 respectively, and the upstream exhaust pressure detected by the upstream pressure sensor and the downstream exhaust pressure detected by the downstream pressure sensor. The difference (pressure difference between before and after) may be calculated. In this case, the upstream and downstream pressure sensors serve as differential pressure sensors.

また、エンジン１１のシリンダブロックには、冷却水温を検出する冷却水温センサ２６や、ノッキングを検出するノックセンサ２７が取り付けられている。また、クランク軸２８の外周側には、クランク軸２８が所定クランク角回転する毎にパルス信号を出力するクランク角センサ２９が取り付けられ、このクランク角センサ２９の出力信号に基づいてクランク角やエンジン回転速度が検出される。   A cooling water temperature sensor 26 that detects the cooling water temperature and a knock sensor 27 that detects knocking are attached to the cylinder block of the engine 11. A crank angle sensor 29 that outputs a pulse signal every time the crankshaft 28 rotates by a predetermined crank angle is attached to the outer peripheral side of the crankshaft 28, and the crank angle and the engine are determined based on the output signal of the crank angle sensor 29. The rotation speed is detected.

これら各種センサの出力は、電子制御ユニット（以下「ＥＣＵ」と表記する）３０に入力される。このＥＣＵ３０は、マイクロコンピュータを主体として構成され、内蔵されたＲＯＭ（記憶媒体）に記憶された各種のエンジン制御用のプログラムを実行することで、エンジン運転状態に応じて、燃料噴射量、点火時期、スロットル開度（吸入空気量）等を制御する。   Outputs of these various sensors are input to an electronic control unit (hereinafter referred to as “ECU”) 30. The ECU 30 is mainly composed of a microcomputer, and executes various engine control programs stored in a built-in ROM (storage medium), so that the fuel injection amount and the ignition timing are determined according to the engine operating state. The throttle opening (intake air amount) and the like are controlled.

図２乃至図４に示すように、片栓フィルタ３１は、排出ガス流れ方向（入口側から出口側に向かう方向）に延びる複数のセル３３が多孔質の隔壁（仕切壁）３４によって区画形成され、複数のセル３３のうちの一部のセル３３の入口側の端部が封止部材３５で閉鎖されて、全てのセル３３の出口側が開放された構造となっている。本実施例では、入口側が閉鎖されて出口側が開放されたセル（以下「入口閉鎖セル」という）３３Ａと、入口側と出口側が両方とも開放されたセル（以下「両側開放セル」という）３３Ｂとが隣り合うように交互に配置されている。   As shown in FIGS. 2 to 4, the single plug filter 31 has a plurality of cells 33 extending in the exhaust gas flow direction (direction from the inlet side to the outlet side) partitioned by a porous partition wall (partition wall) 34. The end portion on the inlet side of some of the cells 33 among the plurality of cells 33 is closed by the sealing member 35, and the outlet side of all the cells 33 is open. In this embodiment, a cell 33A in which the inlet side is closed and the outlet side is opened (hereinafter referred to as “inlet closed cell”) 33A, and a cell in which both the inlet side and the outlet side are opened (hereinafter referred to as “double-side open cell”) 33B; Are alternately arranged so as to be adjacent to each other.

この片栓フィルタ３１は、両側開放セル３３Ｂの入口側からセル３３Ｂ内に排出ガスが流入すると、両側開放セル３３Ｂ内の圧力が上昇して、入口閉鎖セル３３Ａ内の圧力が両側開放セル３３Ｂ内の圧力に対して相対的に低くなる。このため、両側開放セル３３Ｂから排出ガスの一部が、多孔質の隔壁３４を通過して入口閉鎖セル３３Ａ内に流入して、入口閉鎖セル３３Ａの出口側からセル３３Ａ外へ流出する。その際、排出ガス中のＰＭ（例えば粒径が２０〜１００ｎｍのＳＯＯＴ粒子）が隔壁３４の気孔内（気孔の内壁面）や表層壁面に付着して捕集される。また、排出ガス中の不燃性物質（例えばエンジン１１のオイルに起因する灰分）であるアッシュも隔壁３４の気孔内や表層壁面に付着して捕集される。   In the single plug filter 31, when exhaust gas flows into the cell 33B from the inlet side of the both-side open cell 33B, the pressure in the both-side open cell 33B rises, and the pressure in the inlet-closed cell 33A is increased in the both-side open cell 33B. Relative to the pressure of. For this reason, a part of the exhaust gas from the both-side open cell 33B passes through the porous partition wall 34, flows into the inlet closed cell 33A, and flows out of the cell 33A from the outlet side of the inlet closed cell 33A. At that time, PM (for example, SOOT particles having a particle diameter of 20 to 100 nm) in the exhaust gas is collected by adhering to the pores (inner wall surfaces of the pores) and the surface wall surfaces of the partition walls 34. In addition, ash, which is a non-combustible substance in the exhaust gas (for example, ash due to the oil of the engine 11), is also collected by adhering to the pores of the partition wall 34 and the surface wall surface.

また、ＰＭセンサ３２は、出力特性がリニアタイプのＰＭセンサを用いることが望ましいが、出力特性が積算タイプのＰＭセンサを用いるようにしても良い。図５に示すように、リニアタイプのＰＭセンサは、排出ガス中のＰＭ量に応じてセンサ出力がリニアに変化する。一方、図６に示すように、積算タイプのＰＭセンサは、ＰＭセンサに付着するＰＭ量の積算値が一定値以上になると、そのＰＭ量の積算値に応じてセンサ出力が変化する。   The PM sensor 32 is preferably a PM sensor having a linear output characteristic, but may be a PM sensor having an integral output characteristic. As shown in FIG. 5, in the linear type PM sensor, the sensor output changes linearly according to the amount of PM in the exhaust gas. On the other hand, as shown in FIG. 6, in the integration type PM sensor, when the integrated value of the PM amount adhering to the PM sensor exceeds a certain value, the sensor output changes in accordance with the integrated value of the PM amount.

また、図７に示すように、片栓フィルタ３１のＰＭ堆積量（片栓フィルタ３１に堆積したＰＭ量）に応じて、片栓フィルタ３１の前後差圧が変化して、差圧センサ３６の出力が変化するため、差圧センサ３６の出力から片栓フィルタ３１のＰＭ堆積量を求めることができる。   Also, as shown in FIG. 7, the differential pressure across the single plug filter 31 changes according to the amount of PM deposited on the single plug filter 31 (the amount of PM deposited on the single plug filter 31). Since the output changes, the PM accumulation amount of the single plug filter 31 can be obtained from the output of the differential pressure sensor 36.

ところで、ＰＭ捕集用の片栓フィルタ３１を備えたシステムでは、片栓フィルタ３１のＰＭ堆積量が多くなり過ぎると、排気の圧力損失が大きくなる。このため、ＥＣＵ３０は、片栓フィルタ３１に捕集されたＰＭを燃焼させて除去する再生制御を実施して、片栓フィルタ３１を再生させる（片栓フィルタ３１のＰＭ堆積量を減少させる）ようにしている。再生制御としては、例えば、所定の燃料カット実行条件が成立したとき（例えば減速時）に実行される燃料カット制御がある。また、片栓フィルタ３１のＰＭ堆積量が所定の上限値を越えたときに、再生制御として例えば空燃比をリーンにする制御や排気温度を上昇させる制御等を実行する。   By the way, in the system provided with the single plug filter 31 for collecting PM, if the amount of PM deposited on the single plug filter 31 is too large, the pressure loss of the exhaust gas becomes large. For this reason, the ECU 30 performs regeneration control for burning and removing the PM collected by the single plug filter 31 so as to regenerate the single plug filter 31 (reducing the amount of PM deposited on the single plug filter 31). I have to. The regeneration control includes, for example, fuel cut control that is executed when a predetermined fuel cut execution condition is satisfied (for example, during deceleration). Further, when the PM accumulation amount of the single plug filter 31 exceeds a predetermined upper limit value, for example, control for making the air-fuel ratio lean or control for increasing the exhaust temperature is executed as regeneration control.

図８に示すように、従来のフィルタは、ＰＭ堆積量が増加した後はＰＭ捕集率がほぼ１００％に維持されるが、片栓フィルタ３１は、ＰＭ堆積量が増加した後もＰＭ捕集率が従来のフィルタよりも低い捕集率（１００％よりも低い捕集率）に維持される。   As shown in FIG. 8, in the conventional filter, the PM collection rate is maintained at almost 100% after the PM accumulation amount is increased. The collection rate is maintained at a lower collection rate than the conventional filter (collection rate lower than 100%).

このため、片栓フィルタ３１を備えたシステムでは、図９に示すように、片栓フィルタ３１の異常によりＰＭ捕集率が低下した場合に、センサ検出ＰＭ量（ＰＭセンサ３２で検出したＰＭ量）が増加するだけでなく、図１０に示すように、エンジン１１の異常によりエンジン１１から排出されるＰＭ量が増加した場合にも、センサ検出ＰＭ量が増加する。また、ＰＭセンサ３２自体の異常によりセンサ検出ＰＭ量が増加する可能性もある。従って、ＰＭセンサ３２で検出したＰＭ量を判定値と比較するだけでは、エンジン１１の異常と片栓フィルタ３１の異常とＰＭセンサ３２の異常とを区別して判定することができず、エンジン１１と片栓フィルタ３１とＰＭセンサ３２のいずれかに異常が発生した場合に、その異常箇所を特定することができない。   For this reason, in the system including the single plug filter 31, as shown in FIG. 9, when the PM collection rate decreases due to an abnormality of the single plug filter 31, the sensor detected PM amount (the PM amount detected by the PM sensor 32). ) Increases, as shown in FIG. 10, the sensor detected PM amount also increases when the PM amount discharged from the engine 11 increases due to an abnormality in the engine 11. Further, the PM amount detected by the sensor may increase due to abnormality of the PM sensor 32 itself. Therefore, by simply comparing the PM amount detected by the PM sensor 32 with the determination value, the abnormality of the engine 11, the abnormality of the single plug filter 31, and the abnormality of the PM sensor 32 cannot be distinguished and determined. When an abnormality occurs in either the single plug filter 31 or the PM sensor 32, the abnormal part cannot be specified.

そこで、本実施例では、ＥＣＵ３０により後述する図１６及び図１７の異常診断ルーチンを実行することで、次のような異常診断を行う。
まず、フィルタ流入ＰＭ量（片栓フィルタ３１に流入するＰＭ量）とフィルタ捕集ＰＭ量（片栓フィルタ３１に捕集されるＰＭ量）とフィルタ流出ＰＭ量（片栓フィルタ３１から流出するＰＭ量）のうちのいずれか一つのＰＭ量を診断用ＰＭ量とし、その診断用ＰＭ量を３通りの推定方法で推定する。本実施例では、診断用ＰＭ量としてフィルタ流入ＰＭ量を次の第１〜第３の推定方法で推定する。 Therefore, in this embodiment, the following abnormality diagnosis is performed by executing abnormality diagnosis routines of FIGS. 16 and 17 described later by the ECU 30.
First, the filter inflow PM amount (the PM amount flowing into the single plug filter 31), the filter collection PM amount (the PM amount collected by the single plug filter 31), and the filter outflow PM amount (the PM flowing out from the single plug filter 31) 1) is set as a diagnostic PM amount, and the diagnostic PM amount is estimated by three estimation methods. In this embodiment, the filter inflow PM amount is estimated by the following first to third estimation methods as the diagnostic PM amount.

第１の推定方法では、エンジン１１の運転条件に基づいてフィルタ流入ＰＭ量を推定する。この第１の推定方法でエンジン１１の運転条件に基づいて推定したフィルタ流入ＰＭ量を「エンジン運転条件に基づいた推定ＰＭ量」という。   In the first estimation method, the filter inflow PM amount is estimated based on the operating condition of the engine 11. The filter inflow PM amount estimated based on the operating condition of the engine 11 by the first estimating method is referred to as “estimated PM amount based on the engine operating condition”.

第２の推定方法では、差圧センサ３６の出力に基づいてフィルタ流入ＰＭ量を推定する。この第２の推定方法で差圧センサ３６の出力に基づいて推定したフィルタ流入ＰＭ量を「差圧センサ出力に基づいた推定ＰＭ量」という。   In the second estimation method, the filter inflow PM amount is estimated based on the output of the differential pressure sensor 36. The filter inflow PM amount estimated based on the output of the differential pressure sensor 36 by this second estimation method is referred to as “estimated PM amount based on the differential pressure sensor output”.

第３の推定方法では、ＰＭセンサ３２の出力に基づいてフィルタ流入ＰＭ量を推定する。この第３の推定方法でＰＭセンサ３２の出力に基づいて推定したフィルタ流入ＰＭ量を「ＰＭセンサ出力に基づいた推定ＰＭ量」という。   In the third estimation method, the filter inflow PM amount is estimated based on the output of the PM sensor 32. The filter inflow PM amount estimated based on the output of the PM sensor 32 by the third estimation method is referred to as “estimated PM amount based on the PM sensor output”.

この後、エンジン運転条件に基づいた推定ＰＭ量と、差圧センサ出力に基づいた推定ＰＭ量と、ＰＭセンサ出力に基づいた推定ＰＭ量とを比較して、エンジン１１の異常と片栓フィルタ３１の異常とＰＭセンサ３２の異常とを区別して判定する。   Thereafter, the estimated PM amount based on the engine operating condition, the estimated PM amount based on the differential pressure sensor output, and the estimated PM amount based on the PM sensor output are compared, and the abnormality of the engine 11 and the single plug filter 31 are compared. And the abnormality of the PM sensor 32 are distinguished and determined.

エンジン１１と片栓フィルタ３１とＰＭセンサ３２が全て正常であれば、エンジン運転条件に基づいた推定ＰＭ量と、差圧センサ出力に基づいた推定ＰＭ量と、ＰＭセンサ出力に基づいた推定ＰＭ量とがほぼ一致するはずである。しかし、エンジン１１と片栓フィルタ３１とＰＭセンサ３２のいずれかに異常が発生すると、その異常箇所に対応した推定ＰＭ量が他の推定ＰＭ量と異なってくる。従って、エンジン運転条件に基づいた推定ＰＭ量と、差圧センサ出力に基づいた推定ＰＭ量と、ＰＭセンサ出力に基づいた推定ＰＭ量とを比較すれば、エンジン１１の異常と片栓フィルタ３１の異常とＰＭセンサ３２の異常とを区別して判定することができる。   If the engine 11, the single plug filter 31, and the PM sensor 32 are all normal, the estimated PM amount based on the engine operating conditions, the estimated PM amount based on the differential pressure sensor output, and the estimated PM amount based on the PM sensor output Should almost match. However, when an abnormality occurs in any of the engine 11, the single plug filter 31, and the PM sensor 32, the estimated PM amount corresponding to the abnormal portion is different from other estimated PM amounts. Therefore, if the estimated PM amount based on the engine operating condition, the estimated PM amount based on the differential pressure sensor output, and the estimated PM amount based on the PM sensor output are compared, the abnormality of the engine 11 and the one plug filter 31 The abnormality and the abnormality of the PM sensor 32 can be distinguished and determined.

具体的には、第１の推定方法では、図１１に示すように、エンジン回転速度、エンジン負荷（例えば吸気管圧力や吸入空気量等）、冷却水温、運転履歴等に基づいて、エンジン排出ＰＭ量（例えばエンジン１１から排出された所定時間当りのＰＭ量）をマップ又は数式等により算出する。エンジン排出ＰＭ量のマップ又は数式等は、予め試験データや設計データ等に基づいて作成され、ＥＣＵ３０のＲＯＭに記憶されている。このエンジン排出ＰＭ量をフィルタ流入ＰＭ量ＰＭＥとする。
フィルタ流入ＰＭ量ＰＭＥ＝エンジン排出ＰＭ量
このようにして、エンジン１１の運転条件に基づいて推定（算出）したフィルタ流入ＰＭ量ＰＭＥを、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとする。 Specifically, in the first estimation method, as shown in FIG. 11, the engine exhaust PM based on the engine speed, engine load (for example, intake pipe pressure, intake air amount, etc.), cooling water temperature, operation history, and the like. The amount (for example, the PM amount discharged from the engine 11 per predetermined time) is calculated by a map or a mathematical expression. A map or numerical formula of the engine exhaust PM amount is created in advance based on test data, design data, and the like, and is stored in the ROM of the ECU 30. This engine exhaust PM amount is defined as a filter inflow PM amount PME.
Filter inflow PM amount PME = engine exhaust PM amount Thus, the filter inflow PM amount PME estimated (calculated) based on the operating condition of the engine 11 is set as the estimated PM amount PME based on the engine operating condition.

第２の推定方法では、まず、差圧センサ３６の出力に基づいて片栓フィルタ３１のＰＭ捕集量（例えば片栓フィルタ３１に捕集された所定時間当りのＰＭ量）を算出する。この場合、例えば、差圧センサ３６の出力に応じたＰＭ堆積量をマップ又は数式等により算出し、このＰＭ堆積量の今回値と前回値との差（所定時間当りのＰＭ堆積量）をＰＭ捕集量として算出する。また、現在のＰＭ堆積量に応じてＰＭ捕集率をマップ又は数式等により算出する。ＰＭ堆積量やＰＭ捕集率のマップ又は数式等は、予め試験データや設計データ等に基づいて作成され、ＥＣＵ３０のＲＯＭに記憶されている。この後、ＰＭ捕集量とＰＭ捕集率とを用いて、次式によりフィルタ流入ＰＭ量ＰＭＤを算出する。
フィルタ流入ＰＭ量ＰＭＤ＝ＰＭ捕集量／ＰＭ捕集率
このようにして、差圧センサ３６の出力に基づいて推定（算出）したフィルタ流入ＰＭ量ＰＭＤを、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとする。 In the second estimation method, first, based on the output of the differential pressure sensor 36, the amount of PM trapped by the single plug filter 31 (for example, the amount of PM collected by the single plug filter 31 per predetermined time) is calculated. In this case, for example, the PM accumulation amount corresponding to the output of the differential pressure sensor 36 is calculated by a map or a mathematical formula, and the difference between the current PM value and the previous value (PM accumulation amount per predetermined time) is calculated as PM. Calculated as the amount collected. Further, the PM collection rate is calculated by a map or a mathematical formula according to the current PM accumulation amount. A map or formula of the PM accumulation amount and PM collection rate is created in advance based on test data, design data, and the like, and is stored in the ROM of the ECU 30. Thereafter, the filter inflow PM amount PMD is calculated by the following equation using the PM collection amount and the PM collection rate.
Filter inflow PM amount PMD = PM collection amount / PM collection rate In this way, the filter inflow PM amount PMD estimated (calculated) based on the output of the differential pressure sensor 36 is estimated PM based on the differential pressure sensor output. The amount is PMD.

第３の推定方法では、まず、ＰＭセンサ３２の出力に基づいてセンサ検出ＰＭ量（例えば片栓フィルタ３１を通過した所定時間当りのＰＭ量）を算出する。この後、センサ検出ＰＭ量とＰＭ捕集率とを用いて、次式によりフィルタ流入ＰＭ量ＰＭＰを算出する。
フィルタ流入ＰＭ量ＰＭＰ＝センサ検出ＰＭ量／（１−ＰＭ捕集率）
このようにして、ＰＭセンサ３２の出力に基づいて推定（算出）したフィルタ流入ＰＭ量ＰＭＰを、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとする。 In the third estimation method, first, based on the output of the PM sensor 32, a sensor detected PM amount (for example, a PM amount per predetermined time that has passed through the single plug filter 31) is calculated. Thereafter, the filter inflow PM amount PMP is calculated by the following equation using the sensor detected PM amount and the PM collection rate.
Filter inflow PM amount PMP = sensor detected PM amount / (1-PM collection rate)
Thus, the filter inflow PM amount PMP estimated (calculated) based on the output of the PM sensor 32 is set as the estimated PM amount PMP based on the PM sensor output.

以上のようにして、各推定ＰＭ量ＰＭＥ，ＰＭＤ，ＰＭＰを算出した後、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤと、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとを比較する。   After calculating the estimated PM amounts PME, PMD, and PMP as described above, the estimated PM amount PME based on the engine operating conditions, the estimated PM amount PMD based on the differential pressure sensor output, and the PM sensor output The estimated PM amount PMP is compared.

その結果、図１２に示すように、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致し、且つ、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥが差圧センサ出力に基づいた推定ＰＭ量ＰＭＤ及びＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰよりも小さい場合には、エンジン１１の異常と判定する。   As a result, as shown in FIG. 12, the estimated PM amount PMD based on the differential pressure sensor output matches the estimated PM amount PMP based on the PM sensor output, and the estimated PM amount PME based on the engine operating condition is When the estimated PM amount PMD based on the differential pressure sensor output and the estimated PM amount PMP based on the PM sensor output are smaller, it is determined that the engine 11 is abnormal.

つまり、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致する場合には、片栓フィルタ３１とＰＭセンサ３２は正常と判断することができる。それらの推定ＰＭ量ＰＭＤ，ＰＭＰよりもエンジン運転条件に基づいた推定ＰＭ量ＰＭＥの方が小さい場合には、エンジン１１の異常によりエンジン１１から排出されるＰＭ量が過多の状態と判断して、エンジン１１の異常（ＰＭ発生量が異常に多い状態）と判定することができる。   That is, when the estimated PM amount PMD based on the differential pressure sensor output matches the estimated PM amount PMP based on the PM sensor output, it can be determined that the single plug filter 31 and the PM sensor 32 are normal. When the estimated PM amount PME based on the engine operating conditions is smaller than those estimated PM amounts PMD and PMP, it is determined that the PM amount discharged from the engine 11 due to an abnormality in the engine 11 is excessive. It can be determined that the engine 11 is abnormal (a state in which the PM generation amount is abnormally large).

図１３に示すように、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致し、且つ、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤがエンジン運転条件に基づいた推定ＰＭ量ＰＭＥ及びＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰよりも小さい場合には、片栓フィルタ３１の異常と判定する。   As shown in FIG. 13, the estimated PM amount PME based on the engine operating condition matches the estimated PM amount PMP based on the PM sensor output, and the estimated PM amount PMD based on the differential pressure sensor output is equal to the engine operating condition. Is smaller than the estimated PM amount PME based on the PM sensor output and the estimated PM amount PMP based on the PM sensor output, it is determined that the one-sided filter 31 is abnormal.

つまり、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致する場合には、エンジン１１とＰＭセンサ３２は正常と判断することができる。それらの推定ＰＭ量ＰＭＥ，ＰＭＰよりも差圧センサ出力に基づいた推定ＰＭ量ＰＭＤの方が小さい場合には、片栓フィルタ３１のＰＭ堆積量が過少の状態と判断して、片栓フィルタ３１の異常（ＰＭ捕集率が異常に低い状態）と判定することができる。   That is, when the estimated PM amount PME based on the engine operating condition matches the estimated PM amount PMP based on the PM sensor output, it can be determined that the engine 11 and the PM sensor 32 are normal. If the estimated PM amount PMD based on the differential pressure sensor output is smaller than the estimated PM amounts PME and PMP, it is determined that the PM accumulation amount of the single plug filter 31 is too small. It is possible to determine that there is an abnormality (a state where the PM collection rate is abnormally low).

図１４に示すように、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致し、且つ、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤがエンジン運転条件に基づいた推定ＰＭ量ＰＭＥ及びＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰよりも大きい場合には、片栓フィルタ３１の再生異常と判定する。   As shown in FIG. 14, the estimated PM amount PME based on the engine operating condition matches the estimated PM amount PMP based on the PM sensor output, and the estimated PM amount PMD based on the differential pressure sensor output is equal to the engine operating condition. Is larger than the estimated PM amount PME based on the PM sensor output and the estimated PM amount PMP based on the PM sensor output, it is determined that the regeneration of the single plug filter 31 is abnormal.

つまり、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致する場合には、エンジン１１とＰＭセンサ３２は正常と判断することができる。それらの推定ＰＭ量ＰＭＥ，ＰＭＰよりも差圧センサ出力に基づいた推定ＰＭ量ＰＭＤの方が大きい場合には、片栓フィルタ３１のＰＭ堆積量が過多の状態と判断して、片栓フィルタ３１の再生異常（再生制御によりＰＭが正常に除去されていない状態）と判定することができる。   That is, when the estimated PM amount PME based on the engine operating condition matches the estimated PM amount PMP based on the PM sensor output, it can be determined that the engine 11 and the PM sensor 32 are normal. If the estimated PM amount PMD based on the differential pressure sensor output is larger than the estimated PM amounts PME, PMP, it is determined that the PM accumulation amount of the single plug filter 31 is excessive, and the single plug filter 31 Regeneration abnormality (a state where PM is not normally removed by regeneration control).

図１５に示すように、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとが一致し、且つ、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰがエンジン運転条件に基づいた推定ＰＭ量ＰＭＥ及び差圧センサ出力に基づいた推定ＰＭ量ＰＭＤと異なる場合には、ＰＭセンサ３２の異常と判定する。   As shown in FIG. 15, the estimated PM amount PME based on the engine operating condition matches the estimated PM amount PMD based on the differential pressure sensor output, and the estimated PM amount PMP based on the PM sensor output is equal to the engine operating condition. When the estimated PM amount PME based on the difference between the estimated PM amount PME and the estimated PM amount PMD based on the differential pressure sensor output is determined to be abnormal.

つまり、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとが一致する場合には、エンジン１１と片栓フィルタ３１は正常と判断することができる。それらの推定ＰＭ量ＰＭＥ，ＰＭＤとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが異なる場合には、ＰＭセンサ３２が正常に機能していない状態と判断して、ＰＭセンサ３２の異常と判定することができる。   That is, when the estimated PM amount PME based on the engine operating conditions matches the estimated PM amount PMD based on the differential pressure sensor output, it can be determined that the engine 11 and the single plug filter 31 are normal. If these estimated PM amounts PME, PMD and the estimated PM amount PMP based on the PM sensor output are different, it is determined that the PM sensor 32 is not functioning normally and it is determined that the PM sensor 32 is abnormal. be able to.

以上説明した本実施例の異常診断は、ＥＣＵ３０によって図１６及び図１７に示す異常診断ルーチンに従って実行される。以下、このルーチンの処理内容を説明する。
図１６及び図１７に示す異常診断ルーチンは、ＥＣＵ３０の電源オン期間中に所定周期で繰り返し実行され、特許請求の範囲でいう異常診断手段としての役割を果たす。 The abnormality diagnosis of the present embodiment described above is executed by the ECU 30 according to the abnormality diagnosis routine shown in FIGS. The processing contents of this routine will be described below.
The abnormality diagnosis routines shown in FIGS. 16 and 17 are repeatedly executed at a predetermined period during the power-on period of the ECU 30, and serve as abnormality diagnosis means in the claims.

本ルーチンが起動されると、まず、ステップ１０１で、エンジン運転条件（エンジン回転速度、エンジン負荷、冷却水温、運転履歴等）を取得する。この後、ステップ１０２に進み、差圧センサ３６の出力を取得した後、ステップ１０３に進み、ＰＭセンサ３２の出力を取得する。   When this routine is started, first, in step 101, engine operating conditions (engine speed, engine load, cooling water temperature, operating history, etc.) are acquired. Thereafter, the process proceeds to step 102 and the output of the differential pressure sensor 36 is acquired. Then, the process proceeds to step 103 and the output of the PM sensor 32 is acquired.

この後、ステップ１０４に進み、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥを算出する。具体的には、エンジン回転速度、エンジン負荷（例えば吸気管圧力や吸入空気量等）、冷却水温、運転履歴等に基づいて、エンジン排出ＰＭ量をマップ又は数式等により算出し、このエンジン排出ＰＭ量をフィルタ流入ＰＭ量ＰＭＥとする。
フィルタ流入ＰＭ量ＰＭＥ＝エンジン排出ＰＭ量 Thereafter, the process proceeds to step 104, and an estimated PM amount PME based on the engine operating condition is calculated. Specifically, based on the engine speed, engine load (for example, intake pipe pressure, intake air amount, etc.), cooling water temperature, operation history, etc., the engine exhaust PM amount is calculated by a map or numerical formula, and this engine exhaust PM. Let the amount be the filter inflow PM amount PME.
Filter inflow PM amount PME = Engine exhaust PM amount

このようにして、エンジン１１の運転条件に基づいて推定（算出）したフィルタ流入ＰＭ量ＰＭＥを、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとする。このステップ１０４の処理が特許請求の範囲でいう第１の推定手段としての役割を果たす。   Thus, the filter inflow PM amount PME estimated (calculated) based on the operating condition of the engine 11 is set as the estimated PM amount PME based on the engine operating condition. The processing in step 104 serves as a first estimation means in the claims.

この後、ステップ１０５に進み、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤを算出する。具体的には、差圧センサ３６の出力に基づいて片栓フィルタ３１のＰＭ捕集量を算出し、このＰＭ捕集量とＰＭ捕集率とを用いて、次式によりフィルタ流入ＰＭ量ＰＭＤを算出する。
フィルタ流入ＰＭ量ＰＭＤ＝ＰＭ捕集量／ＰＭ捕集率 Thereafter, the process proceeds to step 105, and an estimated PM amount PMD based on the differential pressure sensor output is calculated. Specifically, the PM collection amount of the single-ended filter 31 is calculated based on the output of the differential pressure sensor 36, and the filter inflow PM amount PMD is calculated by the following equation using the PM collection amount and the PM collection rate. Is calculated.
Filter inflow PM amount PMD = PM collection amount / PM collection rate

このようにして、差圧センサ３６の出力に基づいて推定（算出）したフィルタ流入ＰＭ量ＰＭＤを、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとする。このステップ１０５の処理が特許請求の範囲でいう第２の推定手段としての役割を果たす。   The filter inflow PM amount PMD estimated (calculated) based on the output of the differential pressure sensor 36 in this way is set as the estimated PM amount PMD based on the differential pressure sensor output. The processing in step 105 serves as second estimating means in the claims.

この後、ステップ１０６に進み、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰを算出する。具体的には、ＰＭセンサ３２の出力に基づいてセンサ検出ＰＭ量を算出し、このセンサ検出ＰＭ量とＰＭ捕集率とを用いて、次式によりフィルタ流入ＰＭ量ＰＭＰを算出する。
フィルタ流入ＰＭ量ＰＭＰ＝センサ検出ＰＭ量／（１−ＰＭ捕集率） Thereafter, the process proceeds to step 106, and an estimated PM amount PMP based on the PM sensor output is calculated. Specifically, the sensor detected PM amount is calculated based on the output of the PM sensor 32, and the filter inflow PM amount PMP is calculated by the following equation using the sensor detected PM amount and the PM collection rate.
Filter inflow PM amount PMP = sensor detected PM amount / (1-PM collection rate)

このようにして、ＰＭセンサ３２の出力に基づいて推定（算出）したフィルタ流入ＰＭ量ＰＭＰを、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとする。このステップ１０６の処理が特許請求の範囲でいう第３の推定手段としての役割を果たす。   Thus, the filter inflow PM amount PMP estimated (calculated) based on the output of the PM sensor 32 is set as the estimated PM amount PMP based on the PM sensor output. The processing in step 106 serves as third estimating means in the claims.

以上のようにして、各推定ＰＭ量ＰＭＥ，ＰＭＤ，ＰＭＰを算出した後、図１７のステップ１０７に進み、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとの差の絶対値｜ＰＭＥ−ＰＭＤ｜が所定のマージンＫ1 以下であるか否かを判定する。ここで、マージンＫ1 は、推定ＰＭ量ＰＭＥの推定ばらつき（推定誤差）と推定ＰＭ量ＰＭＤの推定ばらつきとを考慮して設定した値であり、例えば、推定ＰＭ量ＰＭＥの推定ばらつきと推定ＰＭ量ＰＭＤの推定ばらつきのうちの最大値、或は、推定ＰＭ量ＰＭＥの推定ばらつきと推定ＰＭ量ＰＭＤの推定ばらつきとの合計値に設定されている。   After calculating the estimated PM amounts PME, PMD, and PMP as described above, the process proceeds to step 107 in FIG. 17, and the estimated PM amount PME based on the engine operating condition and the estimated PM amount PMD based on the differential pressure sensor output It is determined whether or not the absolute value | PME-PMD | of the difference between the two is equal to or less than a predetermined margin K1. Here, the margin K1 is a value set in consideration of the estimated variation (estimation error) of the estimated PM amount PME and the estimated variation of the estimated PM amount PMD. For example, the margin K1 is an estimated variation of the estimated PM amount PME and the estimated PM amount. It is set to the maximum value of the estimated variation of PMD or the total value of the estimated variation of the estimated PM amount PME and the estimated variation of the estimated PM amount PMD.

このステップ１０７で、差の絶対値｜ＰＭＥ−ＰＭＤ｜がマージンＫ1 以下であると判定された場合には、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとが一致していると判断する。この場合、ステップ１０８に進み、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとの差の絶対値｜ＰＭＥ−ＰＭＰ｜が所定のマージンＫ2 以下であるか否かを判定する。ここで、マージンＫ2 は、推定ＰＭ量ＰＭＥの推定ばらつきと推定ＰＭ量ＰＭＰの推定ばらつきとを考慮して設定した値であり、例えば、推定ＰＭ量ＰＭＥの推定ばらつきと推定ＰＭ量ＰＭＰの推定ばらつきのうちの最大値、或は、推定ＰＭ量ＰＭＥの推定ばらつきと推定ＰＭ量ＰＭＰの推定ばらつきとの合計値に設定されている。   If it is determined in step 107 that the absolute value | PME-PMD | of the difference is equal to or less than the margin K1, the estimated PM amount PME based on the engine operating condition and the estimated PM amount PMD based on the differential pressure sensor output Is determined to match. In this case, the process proceeds to step 108, and whether or not the absolute value | PME-PMP | of the difference between the estimated PM amount PME based on the engine operating condition and the estimated PM amount PMP based on the PM sensor output is equal to or less than a predetermined margin K2. Determine whether. Here, the margin K2 is a value set in consideration of the estimated variation of the estimated PM amount PME and the estimated variation of the estimated PM amount PMP, for example, the estimated variation of the estimated PM amount PME and the estimated variation of the estimated PM amount PMP. Or the total value of the estimated variation of the estimated PM amount PME and the estimated variation of the estimated PM amount PMP.

このステップ１０８で、差の絶対値｜ＰＭＥ−ＰＭＰ｜がマージンＫ2 以下であると判定された場合には、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致していると判断する。この場合、ステップ１１３に進み、エンジン１１と片栓フィルタ３１とＰＭセンサ３２が全て正常と判定する。   If it is determined in step 108 that the absolute value of the difference | PME−PMP | is equal to or less than the margin K2, the estimated PM amount PME based on the engine operating condition and the estimated PM amount PMP based on the PM sensor output Are determined to match. In this case, the process proceeds to step 113, and it is determined that the engine 11, the single plug filter 31, and the PM sensor 32 are all normal.

これに対して、上記ステップ１０８で、差の絶対値｜ＰＭＥ−ＰＭＰ｜がマージンＫ2 よりも大きいと判定された場合には、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰがエンジン運転条件に基づいた推定ＰＭ量ＰＭＥ及び差圧センサ出力に基づいた推定ＰＭ量ＰＭＤと異なると判断する。この場合、ステップ１１４に進み、ＰＭセンサ３２が正常に機能していない状態と判断して、ＰＭセンサ３２の異常と判定する。   On the other hand, if it is determined in step 108 that the absolute value | PME-PMP | of the difference is larger than the margin K2, the estimated PM amount PMP based on the PM sensor output is based on the engine operating condition. It is determined that the estimated PM amount PMD is different from the estimated PM amount PMD based on the estimated PM amount PME and the differential pressure sensor output. In this case, the process proceeds to step 114, where it is determined that the PM sensor 32 is not functioning normally, and it is determined that the PM sensor 32 is abnormal.

一方、上記ステップ１０７で、差の絶対値｜ＰＭＥ−ＰＭＤ｜がマージンＫ1 よりも大きいと判定された場合には、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとが一致していないと判断する。この場合、ステップ１０９に進み、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとの差の絶対値｜ＰＭＥ−ＰＭＰ｜がマージンＫ2 以下であるか否かを判定する。   On the other hand, if it is determined in step 107 that the absolute value | PME-PMD | of the difference is larger than the margin K1, the estimated PM amount PME based on the engine operating condition and the estimated PM based on the differential pressure sensor output It is determined that the amount PMD does not match. In this case, the process proceeds to step 109, and whether or not the absolute value | PME-PMP | of the difference between the estimated PM amount PME based on the engine operating condition and the estimated PM amount PMP based on the PM sensor output is equal to or less than the margin K2. judge.

このステップ１０９で、差の絶対値｜ＰＭＥ−ＰＭＰ｜がマージンＫ2 以下であると判定された場合には、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致していると判断する。この場合、ステップ１１０に進み、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとの差（ＰＭＥ−ＰＭＤ）がマージンＫ1 よりも大きいか否かを判定する。   If it is determined in step 109 that the absolute value | PME-PMP | of the difference is equal to or less than the margin K2, the estimated PM amount PME based on the engine operating condition and the estimated PM amount PMP based on the PM sensor output Are determined to match. In this case, the process proceeds to step 110, and it is determined whether or not the difference (PME-PMD) between the estimated PM amount PME based on the engine operating condition and the estimated PM amount PMD based on the differential pressure sensor output is larger than the margin K1. .

このステップ１１０で、差（ＰＭＥ−ＰＭＤ）がマージンＫ1 よりも大きいと判定された場合には、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤが他の推定ＰＭ量ＰＭＥ，ＰＭＰよりも小さいと判断する。この場合、ステップ１１５に進み、片栓フィルタ３１のＰＭ堆積量が過少の状態と判断して、片栓フィルタ３１の異常（ＰＭ捕集率が異常に低い状態）と判定する。   If it is determined in step 110 that the difference (PME-PMD) is larger than the margin K1, it is determined that the estimated PM amount PMD based on the differential pressure sensor output is smaller than the other estimated PM amounts PME, PMP. To do. In this case, the process proceeds to step 115, where it is determined that the PM accumulation amount of the single plug filter 31 is too small, and it is determined that the single plug filter 31 is abnormal (the PM collection rate is abnormally low).

これに対して、上記ステップ１１０で、差（ＰＭＥ−ＰＭＤ）がマージンＫ1 以下であると判定された場合には、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤが他の推定ＰＭ量ＰＭＥ，ＰＭＰよりも大きいと判断する。この場合、ステップ１１６に進み、片栓フィルタ３１のＰＭ堆積量が過多の状態と判断して、片栓フィルタ３１の再生異常（再生制御によりＰＭが正常に除去されていない状態）と判定する。   On the other hand, if it is determined in step 110 that the difference (PME−PMD) is equal to or less than the margin K1, the estimated PM amount PMD based on the differential pressure sensor output becomes the other estimated PM amounts PME, PMP. It is judged that it is larger than. In this case, the process proceeds to step 116, where it is determined that the PM accumulation amount of the single plug filter 31 is excessive, and it is determined that regeneration of the single plug filter 31 is abnormal (a state where PM is not normally removed by the regeneration control).

一方、上記ステップ１０９で、差の絶対値｜ＰＭＥ−ＰＭＰ｜がマージンＫ2 よりも大きいと判定された場合には、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致していないと判断する。この場合、ステップ１１１に進み、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとの差の絶対値｜ＰＭＤ−ＰＭＰ｜が所定のマージンＫ3 以下であるか否かを判定する。ここで、マージンＫ3 は、推定ＰＭ量ＰＭＤの推定ばらつきと推定ＰＭ量ＰＭＰの推定ばらつきとを考慮して設定した値であり、例えば、推定ＰＭ量ＰＭＤの推定ばらつきと推定ＰＭ量ＰＭＰの推定ばらつきのうちの最大値、或は、推定ＰＭ量ＰＭＤの推定ばらつきと推定ＰＭ量ＰＭＰの推定ばらつきとの合計値に設定されている。   On the other hand, if it is determined in step 109 that the absolute value | PME-PMP | of the difference is larger than the margin K2, the estimated PM amount PME based on the engine operating condition and the estimated PM amount based on the PM sensor output It is determined that the PMP does not match. In this case, the process proceeds to step 111, where is the absolute value | PMD-PMP | of the difference between the estimated PM amount PMD based on the differential pressure sensor output and the estimated PM amount PMP based on the PM sensor output equal to or less than a predetermined margin K3? Determine whether or not. Here, the margin K3 is a value set in consideration of the estimated variation of the estimated PM amount PMD and the estimated variation of the estimated PM amount PMP, for example, the estimated variation of the estimated PM amount PMD and the estimated variation of the estimated PM amount PMP. Or the total value of the estimated variation of the estimated PM amount PMD and the estimated variation of the estimated PM amount PMP.

このステップ１１１で、差の絶対値｜ＰＭＤ−ＰＭＰ｜がマージンＫ3 以下であると判定された場合には、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとが一致していると判断する。この場合、ステップ１１２に進み、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとエンジン運転条件に基づいた推定ＰＭ量ＰＭＥとの差（ＰＭＤ−ＰＭＥ）がマージンＫ1 よりも大きいか否かを判定する。   When it is determined in step 111 that the absolute value | PMD-PMP | of the difference is equal to or less than the margin K3, the estimated PM amount PMD based on the differential pressure sensor output and the estimated PM amount PMP based on the PM sensor output Is determined to match. In this case, the process proceeds to step 112, and it is determined whether or not the difference (PMD-PME) between the estimated PM amount PMD based on the differential pressure sensor output and the estimated PM amount PME based on the engine operating condition is larger than the margin K1. .

このステップ１１２で、差（ＰＭＤ−ＰＭＥ）がマージンＫ1 よりも大きいと判定された場合には、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥが他の推定ＰＭ量ＰＭＤ，ＰＭＰよりも小さいと判断する。この場合、ステップ１１７に進み、エンジン１１の異常によりエンジン１１から排出されるＰＭ量が過多の状態と判断して、エンジン１１の異常（ＰＭ発生量が異常に多い状態）と判定する。   If it is determined in step 112 that the difference (PMD-PME) is larger than the margin K1, it is determined that the estimated PM amount PME based on the engine operating condition is smaller than the other estimated PM amounts PMD and PMP. . In this case, the process proceeds to step 117, where it is determined that the PM amount discharged from the engine 11 is excessive due to an abnormality in the engine 11, and it is determined that the engine 11 is abnormal (a state in which the PM generation amount is abnormally large).

以上説明した本実施例では、エンジン１１の運転条件に基づいてフィルタ流入ＰＭ量ＰＭＥを推定し、このフィルタ流入ＰＭ量ＰＭＥを、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥとする。また、差圧センサ３６の出力に基づいてフィルタ流入ＰＭ量ＰＭＤを推定し、このフィルタ流入ＰＭ量ＰＭＤを、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤとする。更に、ＰＭセンサ３２の出力に基づいてフィルタ流入ＰＭ量ＰＭＰを推定し、このフィルタ流入ＰＭ量ＰＭＰを、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとする。そして、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤと、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとを比較して、エンジン１１の異常と片栓フィルタ３１の異常とＰＭセンサ３２の異常とを区別して判定するようにしている。   In the present embodiment described above, the filter inflow PM amount PME is estimated based on the operating condition of the engine 11, and this filter inflow PM amount PME is set as the estimated PM amount PME based on the engine operating condition. Further, the filter inflow PM amount PMD is estimated based on the output of the differential pressure sensor 36, and this filter inflow PM amount PMD is set as the estimated PM amount PMD based on the differential pressure sensor output. Further, the filter inflow PM amount PMP is estimated based on the output of the PM sensor 32, and this filter inflow PM amount PMP is set as the estimated PM amount PMP based on the PM sensor output. Then, the estimated PM amount PME based on the engine operating condition, the estimated PM amount PMD based on the differential pressure sensor output, and the estimated PM amount PMP based on the PM sensor output are compared, and the abnormality of the engine 11 and the single plug The abnormality of the filter 31 and the abnormality of the PM sensor 32 are distinguished and determined.

エンジン１１と片栓フィルタ３１とＰＭセンサ３２が全て正常であれば、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤと、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとがほぼ一致するはずである。しかし、エンジン１１と片栓フィルタ３１とＰＭセンサ３２のいずれかに異常が発生すると、その異常箇所に対応した推定ＰＭ量が他の推定ＰＭ量と異なってくる。従って、エンジン運転条件に基づいた推定ＰＭ量ＰＭＥと、差圧センサ出力に基づいた推定ＰＭ量ＰＭＤと、ＰＭセンサ出力に基づいた推定ＰＭ量ＰＭＰとを比較すれば、エンジン１１の異常と片栓フィルタ３１の異常とＰＭセンサ３２の異常とを区別して判定することができる。これにより、エンジン１１と片栓フィルタ３１とＰＭセンサ３２のいずれかに異常が発生した場合に、その異常箇所を特定することができる。   If the engine 11, the single plug filter 31, and the PM sensor 32 are all normal, the estimated PM amount PME based on the engine operating conditions, the estimated PM amount PMD based on the differential pressure sensor output, and the estimation based on the PM sensor output The PM amount PMP should substantially match. However, when an abnormality occurs in any of the engine 11, the single plug filter 31, and the PM sensor 32, the estimated PM amount corresponding to the abnormal portion is different from other estimated PM amounts. Therefore, if the estimated PM amount PME based on the engine operating condition, the estimated PM amount PMD based on the differential pressure sensor output, and the estimated PM amount PMP based on the PM sensor output are compared, the abnormality of the engine 11 and the single plug The abnormality of the filter 31 and the abnormality of the PM sensor 32 can be distinguished and determined. Thereby, when an abnormality occurs in any of the engine 11, the single plug filter 31, and the PM sensor 32, the abnormal part can be specified.

また、本実施例では、各推定ＰＭ量を比較する際に推定ＰＭ量の推定ばらつき（推定誤差）を考慮したマージンを設けるようにしている。これにより、各推定ＰＭ量に推定ばらつきが含まれていても、各推定ＰＭ量を適正に比較することができ、推定ばらつきに起因する誤判定を防止することができる。   In the present embodiment, a margin is provided in consideration of estimation variation (estimation error) of estimated PM amounts when comparing the estimated PM amounts. Thereby, even if estimation variation is included in each estimated PM amount, each estimated PM amount can be properly compared, and erroneous determination caused by the estimated variation can be prevented.

尚、上記実施例では、診断用ＰＭ量としてフィルタ流入ＰＭ量を推定するようにしたが、これに限定されず、診断用ＰＭ量としてフィルタ捕集ＰＭ量又はフィルタ流出ＰＭ量を３通りの推定方法で推定し、各推定ＰＭ量を比較して、エンジン１１の異常と片栓フィルタ３１の異常とＰＭセンサ３２の異常とを区別して判定するようにしても良い。   In the above embodiment, the filter inflow PM amount is estimated as the diagnostic PM amount. However, the present invention is not limited to this, and the filter collection PM amount or the filter outflow PM amount is estimated in three ways as the diagnostic PM amount. The estimation may be performed by a method, and the estimated PM amounts may be compared to distinguish between the abnormality of the engine 11, the abnormality of the single plug filter 31, and the abnormality of the PM sensor 32.

また、上記実施例では、一部のセルの入口側が閉鎖されて全てのセルの出口側が開放された構造の片栓フィルタを備えたシステムに本発明を適用したが、これに限定されず、一部のセルの出口側が閉鎖されて全てのセルの入口側が開放された構造の片栓フィルタを備えたシステムに本発明を適用しても良い。   In the above embodiment, the present invention is applied to a system including a single plug filter having a structure in which the inlet sides of some cells are closed and the outlet sides of all cells are opened. However, the present invention is not limited to this. The present invention may be applied to a system including a single plug filter having a structure in which the outlet side of some cells is closed and the inlet sides of all cells are opened.

また、上記実施例では、一部のセルの入口側が閉鎖されて全てのセルの出口側が開放された構造の片栓フィルタを備えたシステムに本発明を適用したが、これに限定されず、一部のセルの入口側が閉鎖されて残りのセル（入口側が開放されたセル）のうち一部のセルの出口側が閉鎖された構造の片栓フィルタを備えたシステムに本発明を適用しても良い。或は、一部のセルの出口側が閉鎖されて全てのセルの入口側が開放された構造の片栓フィルタや、一部のセルの出口側が閉鎖されて残りのセル（出口側が開放されたセル）のうち一部のセルの入口側が閉鎖された構造の片栓フィルタを備えたシステムに本発明を適用しても良い。要は、一部のセルの入口側と出口側が両方とも開放された構造の片栓フィルタを備えたシステムであれば、本発明を適用することができる。   In the above embodiment, the present invention is applied to a system including a single plug filter having a structure in which the inlet sides of some cells are closed and the outlet sides of all cells are opened. However, the present invention is not limited to this. The present invention may be applied to a system including a single plug filter having a structure in which the inlet side of some cells is closed and the outlet side of some of the remaining cells (cells whose inlet side is opened) is closed. . Alternatively, a single plug filter having a structure in which the outlet side of some cells is closed and the inlet side of all cells is opened, or the remaining cells (cells in which the outlet side is opened) with the outlet side of some cells closed The present invention may be applied to a system including a single-ended filter having a structure in which the inlet side of some of the cells is closed. In short, the present invention can be applied to any system provided with a single plug filter having a structure in which both the inlet side and the outlet side of some cells are open.

また、上記実施例では、筒内噴射式ガソリンエンジンを搭載したシステムに本発明を適用したが、これに限定されず、片栓フィルタを備えたシステムであれば、ディーゼルエンジンや吸気ポート噴射式ガソリンエンジンを搭載したシステムであっても、本発明を適用して実施できる。   In the above embodiment, the present invention is applied to a system equipped with an in-cylinder injection gasoline engine. However, the present invention is not limited to this, and a diesel engine or an intake port injection gasoline may be used as long as the system includes a single plug filter. Even a system equipped with an engine can be implemented by applying the present invention.

１１…エンジン（内燃機関）、３０…ＥＣＵ（第１の推定手段，第２の推定手段，第３の推定手段，異常診断手段）、３１…片栓フィルタ、３２…ＰＭセンサ、３３…セル、３６…差圧センサ   DESCRIPTION OF SYMBOLS 11 ... Engine (internal combustion engine), 30 ... ECU (1st estimation means, 2nd estimation means, 3rd estimation means, abnormality diagnosis means), 31 ... Single plug filter, 32 ... PM sensor, 33 ... Cell, 36 ... Differential pressure sensor

Claims (6)

内燃機関（１１）の排出ガス中の粒子状物質（以下「ＰＭ」と表記する）を捕集するフィルタであって該フィルタに設けられた複数のセル（３３）のうちの一部のセルの入口側が閉鎖されて残りのセルのうち出口側が開放されたセルを少なくとも一つ以上有する構造又は一部のセルの出口側が閉鎖されて残りのセルのうち入口側が開放されたセルを少なくとも一つ以上有する構造の片栓フィルタ（３１）と、
前記片栓フィルタ（３１）の上流側排気圧と下流側排気圧との差を検出する差圧センサ（３６）と、
前記片栓フィルタ（３１）を通過した排出ガス中のＰＭ量を検出するＰＭセンサ（３２）と、
前記片栓フィルタ（３１）に流入するＰＭ量と前記片栓フィルタ（３１）に捕集されるＰＭ量と前記片栓フィルタ（３１）から流出するＰＭ量のうちのいずれか一つのＰＭ量である診断用ＰＭ量を前記内燃機関（１１）の運転条件に基づいて推定する第１の推定手段（３０）と、
前記診断用ＰＭ量を前記差圧センサ（３６）の出力に基づいて推定する第２の推定手段（３０）と、
前記診断用ＰＭ量を前記ＰＭセンサ（３２）の出力に基づいて推定する第３の推定手段（３０）と、
前記第１の推定手段（３０）で推定した診断用ＰＭ量（以下「内燃機関（１１）の運転条件に基づいた推定ＰＭ量」という）と、前記第２の推定手段（３０）で推定した診断用ＰＭ量（以下「差圧センサ（３６）の出力に基づいた推定ＰＭ量」という）と、前記第３の推定手段（３０）で推定した診断用ＰＭ量（以下「ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量」という）とを比較して、前記内燃機関（１１）の異常と前記片栓フィルタ（３１）の異常と前記ＰＭセンサ（３２）の異常とを区別して判定する異常診断手段（３０）と
を備えていることを特徴とする異常診断装置。 A filter that collects particulate matter (hereinafter referred to as “PM”) in the exhaust gas of the internal combustion engine (11), and is a part of a plurality of cells (33) provided in the filter. A structure having at least one cell in which the inlet side is closed and the outlet side is opened among the remaining cells, or at least one cell in which the outlet side of some of the cells is closed and the inlet side is opened A single-ended filter (31) having a structure comprising:
A differential pressure sensor (36) for detecting a difference between an upstream exhaust pressure and a downstream exhaust pressure of the single plug filter (31);
A PM sensor (32) for detecting the amount of PM in the exhaust gas that has passed through the single plug filter (31);
Any one of the amount of PM flowing into the single plug filter (31), the amount of PM collected by the single plug filter (31), and the amount of PM flowing out of the single plug filter (31) First estimating means (30) for estimating a certain PM amount for diagnosis based on operating conditions of the internal combustion engine (11);
Second estimating means (30) for estimating the diagnostic PM amount based on the output of the differential pressure sensor (36);
Third estimation means (30) for estimating the diagnostic PM amount based on the output of the PM sensor (32);
Diagnostic PM amount estimated by the first estimating means (30) (hereinafter referred to as "estimated PM amount based on operating conditions of the internal combustion engine (11)") and estimated by the second estimating means (30) Diagnostic PM amount (hereinafter referred to as “estimated PM amount based on output of differential pressure sensor (36)”) and diagnostic PM amount (hereinafter referred to as “PM sensor (32)” estimated by the third estimating means (30). The estimated PM amount based on the output of the internal combustion engine (11) ", and distinguishing between the abnormality of the internal combustion engine (11), the abnormality of the single plug filter (31), and the abnormality of the PM sensor (32). An abnormality diagnosis device comprising: an abnormality diagnosis means (30). 前記異常診断手段（３０）は、前記差圧センサ（３６）の出力に基づいた推定ＰＭ量と前記ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量とが一致し、且つ、前記内燃機関（１１）の運転条件に基づいた推定ＰＭ量が前記差圧センサ（３６）の出力に基づいた推定ＰＭ量及び前記ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量よりも小さい場合に、前記内燃機関（１１）の異常と判定することを特徴とする請求項１に記載の異常診断装置。   The abnormality diagnosing means (30) matches the estimated PM amount based on the output of the differential pressure sensor (36) with the estimated PM amount based on the output of the PM sensor (32), and the internal combustion engine ( 11) when the estimated PM amount based on the operating condition of 11) is smaller than the estimated PM amount based on the output of the differential pressure sensor (36) and the estimated PM amount based on the output of the PM sensor (32). The abnormality diagnosis device according to claim 1, wherein the abnormality diagnosis device determines that the abnormality is in the engine (11). 前記異常診断手段（３０）は、前記内燃機関（１１）の運転条件に基づいた推定ＰＭ量と前記ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量とが一致し、且つ、前記差圧センサ（３６）の出力に基づいた推定ＰＭ量が前記内燃機関（１１）の運転条件に基づいた推定ＰＭ量及び前記ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量よりも小さい場合に、前記片栓フィルタ（３１）の異常と判定することを特徴とする請求項１又は２に記載の異常診断装置。   The abnormality diagnosing means (30) is configured such that an estimated PM amount based on an operating condition of the internal combustion engine (11) matches an estimated PM amount based on an output of the PM sensor (32), and the differential pressure sensor When the estimated PM amount based on the output of (36) is smaller than the estimated PM amount based on the operating condition of the internal combustion engine (11) and the estimated PM amount based on the output of the PM sensor (32), the piece The abnormality diagnosis device according to claim 1, wherein the abnormality is determined as an abnormality of the plug filter (31). 前記異常診断手段（３０）は、前記内燃機関（１１）の運転条件に基づいた推定ＰＭ量と前記ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量とが一致し、且つ、前記差圧センサ（３６）の出力に基づいた推定ＰＭ量が前記内燃機関（１１）の運転条件に基づいた推定ＰＭ量及び前記ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量よりも大きい場合に、前記片栓フィルタ（３１）の再生異常と判定することを特徴とする請求項１乃至３のいずれかに記載の異常診断装置。   The abnormality diagnosing means (30) is configured such that an estimated PM amount based on an operating condition of the internal combustion engine (11) matches an estimated PM amount based on an output of the PM sensor (32), and the differential pressure sensor When the estimated PM amount based on the output of (36) is larger than the estimated PM amount based on the operating condition of the internal combustion engine (11) and the estimated PM amount based on the output of the PM sensor (32), the piece The abnormality diagnosis device according to claim 1, wherein the abnormality is determined as a regeneration abnormality of the plug filter (31). 前記異常診断手段（３０）は、前記内燃機関（１１）の運転条件に基づいた推定ＰＭ量と前記差圧センサ（３６）の出力に基づいた推定ＰＭ量とが一致し、且つ、前記ＰＭセンサ（３２）の出力に基づいた推定ＰＭ量が前記内燃機関（１１）の運転条件に基づいた推定ＰＭ量及び前記差圧センサ（３６）の出力に基づいた推定ＰＭ量と異なる場合に、前記ＰＭセンサ（３２）の異常と判定することを特徴とする請求項１乃至４のいずれかに記載の異常診断装置。   The abnormality diagnosis means (30) is configured such that an estimated PM amount based on an operating condition of the internal combustion engine (11) matches an estimated PM amount based on an output of the differential pressure sensor (36), and the PM sensor When the estimated PM amount based on the output of (32) is different from the estimated PM amount based on the operating condition of the internal combustion engine (11) and the estimated PM amount based on the output of the differential pressure sensor (36), the PM The abnormality diagnosis device according to any one of claims 1 to 4, wherein the abnormality of the sensor (32) is determined. 前記異常診断手段（３０）は、前記推定ＰＭ量を比較する際に該推定ＰＭ量の推定ばらつきを考慮したマージンを設けることを特徴とする請求項１乃至５のいずれかに記載の異常診断装置。   6. The abnormality diagnosis apparatus according to claim 1, wherein the abnormality diagnosis means (30) provides a margin in consideration of an estimation variation of the estimated PM amount when comparing the estimated PM amount. .
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